GS809C and GS810C Microprocessor Reset Monitors t c u rod P New Description Pin Configuration SOT-23 (Top View) GND 1 3 Reset Output Vcc • When the processor power supply voltage drops below the reset threshold, the reset output is driven active, in less than 40µs (TD1). Reset is maintained active for a time period (TD2), after the Vcc rises above the threshold voltage. 2 Fig. 1 – Typical Application Diagram VCC VCC GS809C Reset GND • The GS809C and 810C are system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. No external components are required. VCC Processor Reset Input GND • To prevent jitter, the reset threshold voltage has a built-in hysteresis of 0.4% of VTH. • The GS809C has an active-low reset output, while the GS810C has an active-high reset output. Both devices have push/pull output drives. • The reset signal is guaranteed valid, down to Vcc = 1.0V. • Low supply current of 3µA makes these devices well suited for battery powered applications. They are designed to reject fast transients from causing false resets. • Both devices are available in a space-saving SOT-23 package. Applications Features • Computers • Battery Powered Equipment • Critical uProcessor and uController power supply monitoring • Tight reset voltage tolerances ± 1.5% • 4 reset active timeout period options • Low quiescent current: < 3µA • 9 reset threshold options from 2.1V to 4.63V • Reset output guaranteed down to 1.0V • No external components • Vcc Transient immunity • Wide temperature range –40°C to +85°C 1 of 6 10/22/01 GS809C and GS810C Microprocessor Reset Monitors Ordering Information Reset Timeout Period Reset Active Low Default: 210mS E: 150mS D: 30mS A : 1.5mS GS809CxxEUx GS810CxxEUx Reset Active High Reset Voltage Options L M J T S 27 R 24 21 Vth = 4.63V Vth = 4.38V Vth = 4.0V Vth = 3.08V Vth = 2.93V Vth = 2.7V Vth = 2.63V Vth = 2.4V Vth = 2.1V Please contact your local General Semiconductor Sales Office for availability of other Threshold Voltage options. Marking Information X XX XX Date Code Year -- Week Threshold Voltage 26: 2.63V 38: 3.8V 46: 4.63V Etc. No letters A: D: E: G: GS809C, 1.5mS GS809C, 30.0mS GS809C, 150.0mS GS809C, 210.0mS L: Q: R: S: GS810C, 1.5mS GS810C, 30.0mS GS810C, 150.0mS GS810C, 210.0mS 2 of 6 GS809C and GS810C Microprocessor Reset Monitors Absolute Maximum Ratings (1) Parameter Symbol Value Unit Vcc 6.0 V –0.3 to (Vcc + 0.3) V Input Current, Vcc 20 mA Output Current, Reset/Reset 20 mA dV/dT (Vcc) 100 V/µS Supply Voltage Reset/Reset Operating Temperature Range TA –40 to +85 °C Storage Temperature Range Tstg –65 to +150 °C Power Dissipation (TA ≤ 70°C) SOT-23 (Derate 4mW/°C above 70°C) PD 260 mW Note: (1) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Electrical Characteristics TA = 25°C unless otherwise noted. Parameter Symbol Vcc Range VRANGE Supply Current Reset Threshold ICC Test Conditions Min Typ Max 1 – 5.5 TA = –40 to +85°C 1 – 5.5 Vcc = 3.0V – – 3.0 Vcc=3.0V, TA= –40 to +85°C – – 5.0 VTHNOM–1.5% VTHNOM VTHNOM+1.5% VTHNOM–2.0% VTHNOM VTHNOM+2.0% VTH TA = –40 to +85°C Threshold Hysteresis VTH HIST 0.4 Reset Threshold Temperature Coefficient Unit V µA V %VTH – 30 – ppm/°C VOL 809C Vcc < VTH min 810C Vcc > VTH max TA = –40 to +85°C ISINK = 1.2mA – – 0.5 V VOH 809C Vcc > VTH max 810C Vcc < VTH min TA = –40 to +85°C ISOURCE = 0.5mA 0.8VCC – – V VCC to Reset Delay TD1 VCC = VTH – 100mV TA = –40 to +85°C – 40 – µS Reset Timeout Period TD2 TA = –40 to +85°C TD2NOM–35% TD2NOM TD2NOM+35% mS Reset Output Voltage Low 809C/810C Reset Output Voltage High 809C/810C 3 of 6 GS809C and GS810C Microprocessor Reset Monitors Ratings and Characteristic Curves (T A = 25°C unless otherwise noted) Fig. 2 – Timing Diagram VTH VTH VCC TD2 50% TD1 50% Reset TD2 50% TD1 50% Reset Fig. 3 – Transient Rejection 140 Supply (VCC) Transients 120 Transient Duration (µS) These devices have a certain immunity to fast negative going transients. The graph titled “Transient Rejection” shows the maximum allowable transient amplitude and duration to avoid triggering an unintended reset. As shown in the graph shorter transients can have larger amplitudes without triggering resets. 100 80 60 40 20 0 0.01 0.1 1 Transient Amplitude (V) 4 of 6 GS809C and GS810C Microprocessor Reset Monitors Ratings and Characteristic Curves (T A = 25°C unless otherwise noted) Fig. 4 – Reset Time vs. Temperature Fig. 5 – ICC vs. Temperature 2.35 220 Supply Current @5V (µA) Reset Time (mS) 215 GS809CREU 210 205 200 195 190 --50 --20 10 40 70 100 2.30 2.25 GS809CREU 2.20 2.15 2.10 --50 130 --20 10 40 70 100 130 Temperature (°C) Temperature (°C) Fig. 7 – ICC vs. VCC Fig. 6 – Reset Vth vs. Temperature 2 2.650 2.648 2.646 1.6 85°C 40°C 2.642 I CC (µA) Reset Vth (V) 2.644 GS809CREU 2.640 2.638 1.2 0°C 0.8 2.636 0.4 2.634 2.632 2.630 0 --50 --20 10 40 70 100 130 Temperature (°C) 0 1 2 3 4 5 VCC (V) Fig. 8 – TD1 Delay vs. Temperature 43 TD1 Delay (µS) 42 41 40 39 38 37 --40 --20 0 20 40 60 80 100 Temperature (°C) 5 of 6 GS809C and GS810C Microprocessor Reset Monitors Ratings and Characteristic Curves (T = 25°C unless otherwise noted) A Fig. 9 – Threshold Hysteresis vs. Temperature Fig. 10 – Reset VOL vs. Temperature 0.265 0.5 0.260 Reset VOL @0.8mA (V) Hysteresis (% of VTH) 0.4 0.3 0.2 0.1 0.255 0.250 0.245 0.240 GS809CREU 0.235 0.230 0.225 0 --40 0.220 --20 0 20 40 60 80 100 --50 Temperature (°C) --20 10 40 70 100 130 Temperature (°C) SOT-23 Case Outline 3.10 2.70 Top View Mounting Pad Layout 3 0.031 (0.8) 3.00 2.60 1.80 1.40 0.035 (0.9) 1 2 1.90 (TYP.) 0.079 (2.0) Dimensions in millimeters 1.40 1.00 0.037 (0.95) 0.25 0.10 1.25 0.70 0.50 0.35 0.15 0.55 0.35 0.037 (0.95) θ1 9° 1° 6 of 6